Severance [1] has a few bits about "office fun" which reflected how awkward work sponsored "fun" can really be.
Personally, the idea of "fundatory" is lost on me; I am working to perform a function that furthers an end goal and in return collect payment for doing so.
If work wishes to have a weekend event or a no-obligation after work get together, the people who wish to be there will happily show up with those who would rather not be there won't.